Scilab Function
Last update : 12/1/2004

lotest - demo of the Lorenz attractor

### Calling Sequence

  `[]=lotest([f_l,odem,xdim,npts,pinit])`
  `[y]=lorenz(t,x)`
  `[]=ilo(sig,ro,beta)`
  `[]=ilof(sig,ro,beta)`

### Parameters

- `f_l`: can be `"loren"` or `lorenz`. it is the name of the external for the Lorenz system. `"loren"` will use a Fortran coded version of the lorenz system and arnold will and `loren` will use a Scilab coded version.`lorentz` is the Scilab macro which code the lorenz system. This macro is loaded when calling `lotest`.
- `ilof, ilo`:are used to fix the parameters of the Fortran and Scilab code version of the Lorenz system.
- `odem,xdim,npts`: are optional arguments. Their meaning and syntax can be found in the portr3d help

### Description

A call to the function `lotest()` will interactively display a phase portrait of a the following dynamical system

     y(1)=sig*(x(2)-x(1));
     y(2)=ro*x(1) -x(2)-x(1)*x(3);
     y(3)=-beta*x(3)+x(1)*x(2);

### See Also

`portr3d`, `ode`, `chaintest`, `lotest`,